On Bplans.com, you can find over 500 sample plans for businesses of all kinds. They're a good place to start and can make it easier for you to develop your own plan because you’ve seen what somebody else has done with theirs.
Be aware, however - you may not find a plan that matches your business exactly. In reality, the only plan that will really work for you will be one that you develop yourself. A sample is useful as an example, not for the specific information it contains.
If you accept that idea, then you’ll find that Bplans has a lot that will apply. You will probably find some sample plans that are similar to your business type. For example, most retail stores have similar business plans. Even if the products described in the sample plan aren’t the same as yours, you'll still see examples of similar market analysis, product or service descriptions that are close, and even financial structures that you can adapt to fit your plan. You can gain a lot of ground like that, even though the business plan isn’t for a business exactly like yours.
You can read more on how to get the most out of a sample business plan here: http://articles.bplans.com/writing-a-business-plan/how-to-get-the-most-out-of-sample-business-plans/1006
And you can search for a sample business plan here: http://www.bplans.com/sample_business_plans.php